for x in range(10):
    print(x)

a = [1,2,3,4,5,6,7,8,9,10,11]
step = 3
b = [a[i:i+step] for i in range(0,len(a),step)]
print(b)
for x in range(0,11,3):
    print(x)
print(range(0,len(a),step))